Speaker
Mr
Egor Frolov
(Budker Institute of Nuclear Physics SB RAS)
Description
Proportional electroluminescence (EL) in noble gases is used in two-phase detectors for dark matter search to record ionization signals in the gas phase induced by particle scattering in the liquid phase (S2 signals). In this work, the EL pulse shapes in a two-phase argon detector have for the first time been studied systematically in a wide electric field range varying from 3 to 9 Td. The pulse shapes were studied at different readout configurations and spectral ranges: using cryogenic PMTs and SiPMs, with and without a wavelength shifter (WLS), in the VUV and visible range. We observed the fast component and two unusual slow components, with time constants of about 5 $\mu$s and 70 $\mu$s. The unusual characteristic property of slow components was that their contribution increased with field. We also show that the fast component may be used to measure the EL gap thickness with sub-mm resolution. The results obtained can have practical applications in DarkSide dark matter search experiment.
Primary author
Mr
Egor Frolov
(Budker Institute of Nuclear Physics SB RAS)
Co-authors
Dr
Alexander Bondar
(Budker Institute of Nuclear Physics SB RAS)
Prof.
Alexey Buzulutskov
(Budker Institute of Nuclear Physics)
Mr
Andrey Sokolov
(Budker INP)
Mrs
Ekaterina Borisova
(Budker Institute of Nuclear Physics SB RAS)
Mr
Valery Nosov
(Budker Institute of Nuclear Physics SB RAS)
Mr
Vladislav Oleynikov
(Budker Institute of Nuclear Physics SB RAS)
